private LogSequence FindActiveLogSequence()
{
using (Stream logStream = new CircularStream(new SubStream(_fileStream, (long)_header.LogOffset, (long)_header.LogLength), Ownership.Dispose))
{
LogSequence candidateActiveSequence = new LogSequence();
LogEntry logEntry = null;
long oldTail;
long currentTail = 0;
do
{
oldTail = currentTail;
logStream.Position = currentTail;
LogSequence currentSequence = new LogSequence();
while (LogEntry.TryRead(logStream, out logEntry)
&& logEntry.LogGuid == _header.LogGuid
&& (currentSequence.Count == 0
|| logEntry.SequenceNumber == currentSequence.Head.SequenceNumber + 1))
{
currentSequence.Add(logEntry);
logEntry = null;
}
if (currentSequence.Count > 0
&& currentSequence.Contains(currentSequence.Head.Tail)
&& currentSequence.HigherSequenceThan(candidateActiveSequence))
{
candidateActiveSequence = currentSequence;
}
if (currentSequence.Count == 0)
{
currentTail += LogEntry.LogSectorSize;
}
else
{
currentTail = currentSequence.Head.Position + LogEntry.LogSectorSize;
}
currentTail = currentTail % logStream.Length;
}
while (currentTail > oldTail);
return candidateActiveSequence;
}
}
public BroadcastServer(string source)
{
_source = source;
buffer = new CircularStream(ushort.MaxValue);
}